Radio tuning mechanism



Nov. 18, 1930. c. SCHEIBEI.

RADIO IlUNINGr MECHANISM Filed' Aug. 15,' 1930 2 Sheets-Sheet l Nov. 18, 1930. c. SCHEIBEL 1,782,368

RADIO TUNING MECHANISM Filed Aug. 13, 1930 2 Sheets-Sheet 2 l Patented Nov. 1s, 1930 c CHARLES. scHEIBEI., lor oIIIoAGo, IVLIJINoIs`,ZAssrGI\ioR I'ro onowEVNAnIErLATei ILLINoIs, A. coIaPoaArIorroF lII-.LINoIsVv radio-tuning mechanism v peripheral edge.

y dialembodying metal circular disk 10 havingextending lat-v MANUFACTURING Y co., yor CHICAGO,v

RADIO TUNING vIi/InoHANIsiir Application fiiedAugust 13, 19x30.' seria1'Nok475,oa5.lf" ffl, f f

My invention relates',more particularly, to n ofvthe'rotary dial type and in which the dial is mounted lfor rotation aboutl an axis extending substan-V tially parallel with the front panel of the casing of the radio-receiving apparatus andis actuated by manual force applied to it at its My primary objects, generally stated, are

to provide a novel, simple andinexpensive construction of scale-dial of the type` stated; to provide a construction of such form as to adapt it for greater ease of accurate position-A ing rotatably 'about its axis; to provide a novel, and simple means for securingthe scale strip to the disk portion of the dial'device; and otherobjects as will be manifestv from the following description.

Referring to the` accompanying drawings: F igure l i-s a fragmentary front view of al radio-receiving apparatus equipped with a my invention. y Figure 2 is' a plan sectional .view' taken through the radio-receiving apparatus .show-* ing myA improved'dial and the `condenser connected therewith dial, in plan. v u A.

Figure 3 is a section takenatthe irregular line 3&3 on Fig. 2 and viewed in the direcand operated by` said -tion of the arrow. f y f -Figure lis a sectional viewfol the dial taken at the line i-4 on Fig. Band viewed in the'direction of thearrows.

Figure 5 is a sectional view taken through the peripheralr portion of the dialgand Figure 6 a perspectiveview of one end of the scale-strip forming-a part'oi the dial device. j

In the drawings I' have shown my improved scale-dial for controllingtheoperation of conden-ser mechanism, of radio-receiving apparatus, vrepresented at 7 and shown partly broken away, the casing of a portion of the front panel of the apparatus being shown at 8, the shaft of the condenser mechanism. being lshown at 9.

My improved scale-dial comprises a sheeterally therefrom a. peripheral annular rim 11 integrally as by its f concave surface, outer surface of the rim,y knurled las represented at 12,*the edge larliange -lforming a shoulder,.the disk 10,

rim l1 and flange 13V vbeing preferably formed form-ing Ithemifroin a. lsinglej sheet of metal.r

' lTheV center of the-dislflO is aperturedwasV represented at 14- i-n `which a. tubular mmber 15 lis secured, the

on the shaft.

'.The scale-dial:y also'v comprises amember' presenting a scale calibrated asis ,customaryy in radio receiving'apparatus and cooperating with a stationary pointerto rguide the oper- 'which exposed at y I* of the rim oppositethat 'v atwhich it is connected withithe disk 10 being provided withan inwardly extending annu? vator inrotatablyadjusting the condenser to the desired position.v

The .scale-equipped ymember"referred t inthe form of' astriplof metal or other suitable'material presentingfon a face there-A of thefscale referred to andrepresented at 17. vThe scale-member16fpreferably of sheet V.metalgis .positioned to extend at-its outer-y scaleequipped fac'eflatwise against` the innerzf edge.v .of the :flange 13 and preferably fat itsKV inner edge againstthe face-*of thedislst-10` yadjacentjgthel flange 13, the Vmember 16 being held statiOnarily. on the disk 10 by lugs '18 extending laterallyfrom the disk 10,fthe`se l.

lugsbeing shown as'iormed of tongues par-A tially cutk from rthemetal ofthe disk l0 and.V

bent to extend f at ari'ght-angle. thereto.- The me'mber lobearslatwise against the outer surfaces of the lugs 18 and is shown'as connected therewith by tougues 19. partially cutfrom themetal of thefmember 16 at its end portions andbent `to extend throughA vropenin'gsQO, in the lugs 18 and underlie th inner surfaces of the lugs as shown.

The' tongues 19 preferably are kso disposed,- that when bent baclrinto position they extend in as shown, to interlock'with the lugs 18, y opposite directions toward the adjacent ends 19 are sorelatively disposed that in'bending of the member 16, andthelugs 18g and tonguesi s the flange 13.: ,Y

The dial which is thus positioned substantially at a right angle tothe panel 8 registers with,`and projects into, an opening21 in an escutcheon plate "22 v secure of the panel at an openi g 23 inthe latter,

whereby the peripheral edge of the dial is Vrendered accessible for engagment by the opferator for actuating thecondenser;y A The opening 21 is so shaped as shown in Fig'. 1 that itrregisters with the scale-portion 16 of thedial for exposing the latter to view,

d to the front'face Y a disk of sheet material provided with a rim, and a ange at the outer edge of said rim and extending inwardly toward the central axis of said dlsk.

8.V A radio' drum tuning dial comprising the pointer hereinbefore referredpto for cov operation with the scale being provided on the escutcheon 22 and represented at 24.

A dial `thus constructed is not only of sim ple and inexpensive construction, but the provision ofthe outerfsurface of the rimportion 11 of concave Yform ensures a more accurate ingeringof the dial. v

.While .I have illustrated and described V.a particular construction embodying my invention I do not wishto be understood as intending to limit it thereto as thesame may bepvariously modified and altered without de arting Jfrom the spirit of my invention. 'Y v""What l claim asnew, and desire to secure by Letters Patent, is: A' Y f 1. A radio drum tuning dialhaving a con-V caved peripheral edge.

V2. A radio drum tuning Vdial having apon- Y i caved knurled peripheral edge. v

A radio drum tuningdial comprising adisk of sheet material provided with a' rim,

V.and a. flange extending. inwardly romsaid rim toward the central axis of saidpdisk.

4. A radio drum tuning Adialcomprising a disk Vhaving van -arc shaped shoulder; at one'side ofsaid disk, lugs projecting fromA said disk at saidvside, a scale-strip,fandfmeans i Vfor attaching :said strip to saidlugs operative,-

' in the act ofattaching said strip to saidlugs;` vf.

to `forcesaid strip into close engagement-.with said shoulder. j

` 5. Aradio drumftuning dial comprising shaped shjoulderatV a. disk having yan arc one side of saiddisk, 'lugs projectingffrom said disk at said side,v a scale-strip, and

tongues on said strip for interlock with said' lugs.

V6. A radiodrum tuningdial comprising a disk having an arc shaped shoulder at one side of said disk, lugs projecting from said disk at said side,l a 'scale-strip, and bendablev I tongues on'said strip for interlock with said lug's,said tongues being sodisposed that theyv n operate when benttoattaching position relative to said lugs, to force'v said strip into Vengagement with saidshoulder.

` i VLA xadiofdruin-` tuning-,dial vcomprising 

